@article{10_4064_am_7_4_419_433,
     author = {A. Niwi\'nska},
     title = {Zastosowanie wska\'znik\'ow {Perkala} do analizy zespo{\l}u cech psychologicznych},
     journal = {Applicationes Mathematicae},
     pages = {419--433},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {1963},
     doi = {10.4064/am-7-4-419-433},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-7-4-419-433/}
}